uv_textures.active.data[0].uv equivalent in Blender 2.7?
Ok, I've found a solution, maybe not the optimum one, but it works:

for iFace, BFace in enumerate( BMesh.data.polygons ):
    FaceUVs = []

    for i in BFace.loop_indices: # &lt;-- python Range object with the proper indices already set.
        l = BMesh.data.loops[i] # The loop entry this polygon point refers to.
        for j,ul in enumerate(BMesh.data.uv_layers):
            FaceUVs.append( [ul.data[l.index].uv[0], ul.data[l.index].uv[1]] )